Machine for cutting or severing metallic bars



April 19. 1927.

F. SCHIESS MACHINE FOR CUTTING 0R SEYERING METALLIC BARS Filed Jan. 25',1923 Patented Apr. 19, 1927.

FRITZ SCHIESS, OF LICI-ITENSTEIG, SWITZERLAND.

MACHINE FOR CUTTING GR SEVERING- METALLIC BARS.

Application filed January 25, 19.23.

The present invention relates to a new and improved machine for cuttingor severing; metallic bars and cutting or punching metal bars, sheetmetal and so on.

The object of the invention is to provide an improved machine for thepurpose stated which will produce a smooth fracture and no deformationof the parts of the bar, etc, adjacent the position of the break or cut.

I attain this and other objects by means of a machine having two pairsof dies inclcsing the bar etc. to be severed and means to move the diesof each pair with reference to each other and moreover one pair of dieswith reference to the second pair.

A further feature of my invention consists in the means for closing thedies and moving one pair of dies with reference to the other byhydraulic means.

The preferred embodiments of my tion are shown in the accompanying ingsin which,

Figure l is a sectional elevation of a machine constructed in accordancewith my in vention.

Figures 2 and 3 are sections of the same re spectively on the lines E-Fand Gl-l.

In the construction shown in the drawings a machine is shown adapted topierce sheet metal of great thickness. In the base 40 a cylindrical die41 is slidably mounted within a. guide block 42 fixed to the casing 40.The die 41 is connected to a piston projecting into a chamber 45. Saidchamber 45 is connected by a pressure pipe 46 to a pump not shown in thedrawings. Above the base 40 in a casing 46 two pistons 47, 48 are shownone, 48, Within the other 47. The pistons 47, 48 slide independently ofeach other. Piston 47 projects into a chamber 49 which is connected by apipe 50 to a hydraulic pressure pum and piston 48 projects into achamber 51 W ich by means of a pipe 52 is connected inven draw- SerialNo. 615,131.

to another hydraulic pressure pump. Piston 48 operates a die 53corresponding in di- 4 ameter to the diameter of the die 41' and to thediameter of the hole which is to be pierced in the sheet metal piece 54.Die 53 is screwed on to a spindle 55 which passes through a bore orpiston 48 and through a 50 pipe screwed into the upper portion of thedie 53. The upper ends of spindle 55 and of the pipe 56 are connected toa sleeve 57 on which a spring 58 acts. The said spring 58 tends to liftthe dies and the piston 47. 55 The lower end of the piston 47 carries apr s.) plate (50 of hard material with ad justable ring 61 said parts60, 61 pressing the working piece 54 against press plate 62 of the die42.

The machine works as follows:

After the piece 54 has been brought on the die 42 the pressure inchamber 49 is raised and the piston 47 is pressed on to the worlc ingpiece 54. The pressure is raised up to a 65 point on which the piece 54would be deformed. The pressure in the chamber 51 is raised above thatpoint and is made to exceed that in chamber 45 in such a manner that thedie 53 passes through the piece 54. The cut is quite clean. The means tovary the pressure on the several pistons are known to anyone versed inthe art.

Having thus described my invention, what I claim as new is In machine ofthe-class described, the combination of a fixed die, a pair ofindependently operable dies opposite said fixed die, independentlyoperable fluid pressure actuated means for actuating said independ- 80ently operable dies, and comprising a pair of pistons, arranged onewithin the other and means to yieldingly resist the movement of one ofsaid pair of dies.

In witness whereof I afix my signature.

FRITZ SCHIESS.

